Idiopathic pulmonary fibrosis

(A) Chest radiograph shows typical peripheral reticular opacity, most marked at the bases, with honeycombing. Lower lobe volume loss (not present in this case) is also common. Chest radiographs may occasionally be normal in patients with IPF. (B and C) CT images show basal predominant, peripheral predominant reticular abnormality with traction bronchiectasis and honeycombing, typical of IPF.